Merged r14185 into 3.14 branch.

Add an option to dump core when an uncaught exception is thrown.

This is done as a courtesy to node.js, as its current stable version (0.10)
relies on V8 version 3.14.5.

R=ulan@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/15858003

git-svn-id: https://v8.googlecode.com/svn/branches/3.14@14772 ce2b1a6d-e550-0410-aec6-3dcde31c8c00